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Optical methods of generation and detection of ultrasound wave in thin-wall structures
Trnka, Jan ; Landa, Michal
Double pulse holointerferometry and laser interferometry were used to study guided waves propagation in thin-wall structures. The full-field visualisation of the displacements caused by generated waves was carried out by DPHI with ruby laser like a s ce of light and the source of quided waves in different time after impact. The time history of displacements and velocities was detected noncontactly in the points on the surface by vibrometr Polytec.
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Non-destructive material evaluation by non-contact ultrasound
Landa, Michal
The paper presents new non-invasive ultrasonic methods have been developed for physical properties evaluation of namely non-porrous materials. Two non-invasive ultrasonic methods (laser ultrasound, ultrasound with air-coupling) were described and advages and limitations are shown on the experimental results.
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Generation of elastics waves by moveing source
Ježdík, Roman ; Landa, Michal
Principle of elastic waves generation by moving source realized by transducer array is performed. Numerical model of this generation technique is used for studying reflection and refraction coefficient on planar water-glass interface. Comparison with retical values of coefficients is done. Differences between numerical model and theory are discussed.
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